Aquarium air pump



FIG. 1 is a top perspective view of an aquarium air pump showing our new design, with the broken lines shown for illustrative purposes only;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevational view thereof, the rear being substantially similar in appearance;

FIG. 4 is an opposite side elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for an aquarium air pump, substantially as shown. 